Grinding-mill.



E. C. GRiFFN. DECBs QL. M. GRIFHN, EXECUTRIX.

Gamme Mm. APPLICATIDN FILED AUG- !0. 1914. i LY@ Patented. Mdr. H, ,13%. 2 SHEETS-SHEET I.

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E. C. GRFHN DECD. L, M. GRIFFIN. zxfcurmx.

GRINDING MILL. APPLICMSON FILED Aue. 10. 1914.

L, Patented Mar. M, M6.

2 SHEETS-SHEET 2.

'xcu'rix of @starte of 7 /f dwin @Griffin decemsed,

inviata srarias EDWIN C. GRIFFIN', DECEASED, LATE OF NEWTN, MASSACHUSETTS, BY LOVINA f. GRIFFIN, EXECUTBIX, OF BRIGHTON, MASSACHUSETTS, ASSIGNQR T BRADLEY PULVERZER COMPANY, .A COBLDORATON CF MAINE.

Specification of Letters Eatent.

rimase'.

Patented Lt i.

.application tiled August lo, 1914. Serial No. 856,0S4.

State of h'lassachusetts, did invent an Improvement in irinding-ll/lills, of 'which the following description, in connection with y the accompanying drawing, is a specifica* tion. like characters on the drawing representinglike parts. l

This invention rel ates to improvements in crushing or pulverizing mills, particularly to the type in which the material is pulverized between a series oit centritugally actuated crushintfi` rolls and a cooperating annular die. ln mills of this type it is usual to providel overhead supportingand driving shafts 'for the crushing rolls and heretofore it has been necessary to utilize a heavy shaft and heavy bearings to afford suilicient rigidity and strength to withstand the torque and vibratory stresses caused by the engagement ot' the crushing;1 rolls with the material in thegrinding chamber.

'One of the objects of this invention is to provide means adapted to more rigidly support the centrifugallv actuated crushing rolls and to, reduce the stresses upon the overhead hearings which suppoil'xt thecrotat in g members.

ln the preferred embodiment ol""thi-1L'iiny vention illustra-ted herein this is accoini.\

plished by hanging` the carrier for the ceii tritugallyactimted rolls upon a quill shaft which is supported froin'an overhead bearing' and is also rotatably mounted upon a central upright shaft, suitable bearings beu ing' provided between the quill shatt and the upright shaft above the carrier and also below the sa me, thc latter preferably being disposed in close proximity thereto tov reduce vibration oi the shaft as much as possible.

Another object of the invention is to provide a suitable journal bearing for an overhead shaft.' preferablya quill shaft which will provide for the lubrication of the sup porting bearing for vsaid shaft.

Another object of the invention is to pro- 'vide means included Within a quill shaft of the character above described for conducting a lubricant from a reservoir inclosing the end of' said shaft to the journals of the shafts of the c entrilugally actuated rolls.

Another object ot' the invention is to provide means for continuously supplying a lubricant to the bearings of the shaft upon Vwhich the centrifugally-actuated rolls are mounted.

Another object of the invention is to provide a shorterand more rigid support for the plow which agitates the material in the grinding pan and forces the same into the path of the rolls.

Other objects of fully appear from the followingI description and the accompanying drawings and will be pointed out in the appended claims.

In the drawings: l is a vertical axialv section of a. grinding inill embodying one oi the preferred forms ot the invention, Fig. 2 is a horizontal sectional view on the 'line :urm Fig. 1the supporting frame and' mechanisrn 'for operating the feeding, mechanism being omitted, llig. 3 is a detail view of the upper end of the quill shaft illustrated in Fig. Il. Fig. fl is a vertical sectional view of a portion of the upper end of the quill shaft showing' the form of the oil groove. 5

is a detail sectional view illustrating a inodified form of quill shaft having longitudinally drilled oil ducts and the inclosed upright'shaft. l

' The preferred embodiment of the invention illustrated herein coni-prises a bed plate l. having an upturned annular curb 2 forniV ingr a pan adapted 'to receive the material to be' ground said annular curb Z being pro- -vided with an upper detachable section 3 and cooperating therewith to embrace an annular die il.

i lThe base l may be provided with lateral projections adapted to receive the lower ends oi 'a preferably :it shapedrarne comprising standards 5 and 6 baiting suitable cross' pieces 7 and 8 adapted to 'support the vhead 9 which carries the rotating driving shaft for the centrifugally-actuated rolls.

A suitable grinding chamber is formed by the invention will more lso a preferably cylindrical inclos-ing casing lO having' an annular cover ll extending inwardly a portion of the distance towardthe center of the mill and provided with a downwardly projecting,r flange l2 terminating near the circumference of the path in which the shafts of the grinding rolls more.

'A screen l'is preferably sul'niorted between the upper edge of the removable curb 3 and the under face of the cover 11 in the usual manner to provide an annular channel 14.

.into the grinding chamber.

The bed 1 is preferably provided with a central boss 2O havinga tapered 'opening 21 to receive the end of a shaft 22 which may be secured therein by a pin or in any other suitable manner. The shaft 22 is preferably solid and extends vertically from the center of the base to a point a short distance above lthe top of the supporting frame and terminates within a suitable lubricant reservoir carried by the head 9, which will hereinafter be fully described.

The rotating grinding members are carried by a quill shaft 25 having integral bearings preferably adjacent to its ends rotatably mounted upon said central shaft 22,

, and having at its upper end a wear plate or collar 2G which may be secured to 'Said quill shaft by a tapered or wedge shaped nut or ,collar 27 screwed upon the threaded end of the quill shaft 25.

The quill shaft -is preferably supported in a suitable vertical bearing or journalin the head 9, which is partly spherical in form and engages concaved faces 2S of the cross supports 7 of the frame. Suitable bolts 30 may be provided in the lower portion of the frame 7 to bear upon the dcpending end of the head 9 so that said bearing may he universally adjusted within the frame. The upper portion of the bearing 9A is preferably provided with an integral upstandingf annular flange 32 forming1 a reservoir adapted to receive a lubricant for the shaft bearing'. This reservoir may be closed by a suitable cover 3?) having' a removable cap 34. i

The base of the lul'yric'ant reservoir is preferablv made concave to receive a steel bearing plate 35 forming one of the elements of the thrust bearing which supports the quill shaft, the other element of the bearing comprising' the collar 26. Suitable anti-friction means such 'as a ball bearing' 36 may be interposed between the nien'ibers 2G and A pulley 40 .secured to the quill shaftbelow the head 9 serves to impart rotation to the shaft and the centrifugally-actuated rolls siqvported thereby. The lower portion of the quill shaft 25 preferably is enlargedl and tapered as at 4:5 to support a cylindrical Carrier 46 having lateral arms or yokes 47 adapted to support suitable rocker heads 48 carrying the .shafts of the crushing rolls.

The vokes Ll7desirably may be provided with suitable recesses or boxes to receive the lower halves of journals for the trunnion shafts -l9 of the rockerheads the upper halves of said journals being' formed in cap plates 50 bolted to the yokes 47 in the usual manner.'

The' rocker heads are provided with sockets 5l to receiveI the ends of the roll shafts 52 which desirably are tapered as shown at 53 so that the shafts may be secured in the sockets by means of nuts 54 screwed upon the projecting ends of the roll shafts.

The crushing rolls are rotatably connected with and retained upon, the roll shafts by coupling' sleeves 61 bolted to the rolls and shaped to overhang a suitable vshoulder or collar G2 upon said shafts, the

upper ends of the sleeves being elongated to forni tubular guards 63 extending into recesses 64 in the under portions of the rocker heads, suitable metal packing 65 being provided between the roll shafts and the rolls and the surrounding couplings.

The roll shafts 52 are preferably ,pro-

.vided with longitudinal apertures or bores 66 forming oil ductsadapted to conduct a lubricant from the upper ends of the shafts to the lower ends thereof from whence it is permitted to work up between the relatively rotatingr surfaces of said shafts and the rolls and sleeves to maintain the same in a constant state of lubrication. In mills of this character it. has heretofore been customary to provide said roll shafts with caps formingr lubricant chambers but such reservoirs can not bemade of large enough capacity to supply' a sufficient quantity of lubricant to the roll shafts to permit the mill to operate for any considerable length of time, and therefore it has been necessary to frequently shut down the mill in order to replenish these oil reservoirs. One of the principal featuresof the present invention consists in providing means for supplying; a suitable lubricant to said bearings without shutting' down the mill. This meanspreferablv con'iprises a series of grooves or ducts '70 in said quill shaft leading' from the upper end thereof to lateral orifices 71 extend ing through the carrier 46 and connected with the ducts inthe roll shafts 66 bv suitable flexible tubes 72. The'oil ducts 70 may i be cylindrical apertures bored longitudinally in the quill shaft as illustrated in Fig. 5 but preferably are in the foiin of grooves cut or milled in the internal surface of the quill shaft and extending axially thereof. 1n the embodiment of the invention illust-rated herein the barrel of the quill shaft 25 is slightly larger than the upright shaft nitrates 22 and is provided with enlarged recesses at the top and bottom to receive circumferential metallic bushings ST and 90 to Separate the interior of said quill shattfrom the Vupriztgld inclosed shaft as well as to form bearings for the upper and lower Yends ot said quill shaft. l

rlhe lower bearing 90 desir-ably is located in proximity ,to the carrier in order that the greater portion ot the strains of vibration may be .transmitted to the solid vertical shaft and the. quill shaft relieved thereof.

The upper bushing S7 does not extend to the plane of the ends ot the shafts but termi nates a suilicient distance below the same to form a reservoir adapted to communicate with the ends of the oil ducts 70 in the quill shaft.

` ln order to facilitate the entrance of the lubricant into the ducts T0 the end of` the quill shaft may be provided with beveled portions 8S inclining downwardly to the ducts from a point ,in advanceof the ductsI to the mouths thereof, ythe rearward walls of the ducts being preferably vertical to form shoulders 89 to arrest the further flow of the lubricant and cause it to enter said ducts.

The centrifugal `force of the rapidly rotating quill shaft `serves to retain the lubricant `1n the longitudinal ducts or grooves inthe interior of the quill shaft while the action oi? theA forcent gravity causes it to flow downwardly in said grooves to the lateral or radial orifices '7l in' the carrier whence it is caused by centrifugal force to `flow through the flexible' tubes 72 into the ducts in the roll shafts.

The carrier which supports the crushing rolls, as illustrated in the preferred embodiing but this forms no part of the present invention and need not be further described.

, The lower end of the quill shaft supports a horizontally disposed spider 8O which is made in sections adapted to :lit around and inclose the reduced lower end 81 of the quill shaft 25, which may be provided with a rib 852 adapted to-enter an annular recess in the spider 8() and prevent the latter from longiti linal movement on the quill shaft. In-

;l lugs da on the spider sections afford ans for assembling them upon the shaft.

libe spider Vserves to support downwardly extendingarms or carriers for the plows 96, which travel in the grinding chamber beneath the path of the grinding rolls and forces the material in the grinding pan into the path of the rolls. By thus supporting the plows from relatively short arms projecting downwardly from the spider 8O a very strong construction is pro-l vided which withstands the stresses imposed bythe contact ot' the plows with the material in thegrinding- Apan much more reecn tively than where the plows are carried l upon relatively long arms, as is common in prior constructions, and theliability ot the plow carriers to breakage or distortion is greatly decreased. ,f

The spider 80 preferably carries a hori zontally disposed shield Srextending beyond the inner edge of the stationary flangeV l2`afo'resai`d and'serves to retain the pulverized material and the dust in the grinding chamber. y

The interior of the lower end of the quill shaft is provided with a suitable packing ll such as iber or sott metal which may be secured therein against thelower bushing by a suitable stutiing boi; 92 having a flange secured to the underside of the spider 80 by bolts 93 or other suitable fastenings.

It is to be understood that the construetion illustrated and disclosed herein is illustrative merely and that it is not restrictive; and that the invention may be embodied in other forms; for example, while the central shaft is shown as being solid and stationary, it may within the contemplation of the invention, be vided with means for rotating the same. Means may also be provided for supporting,T a ltan upon a rotatable central shaft inside ot the quill shaft and many other and various changes in form and Construction, etc., may be employed without departing- 'from the spirit of this invention.

Having thus described my invention what l claim as new and desire to secure by Letters Patent is:

l. A centrifugal crushing mill comprisf ing achamber containing an annular die, a central upright shaft, a quill shaft rotatably mounted thereon, means carried by said quill shaft to support a series ot'centrifir gally-actuated rolls adapted, to eoperate made hollow, or may be prowith said die, means for supporti-ng. said-- quill' shaft 'independently of said central shaft, and means for rotating the same.

2. A centrifugal crushing mill comprisinga grinding chamber containing an an nulafr die, a central upright shaft, a quill `shaft rotatably mountedy thereon, means for supporting said quill shaft independently of said central shaft, a carrier secured. to said quill shaft, a series of eentrifugally' actuated grinding members depending from said .carrier and movable in substantially radial planes in respect thereto to coperate with said annular die and circumferential bearings between said quill shaft and said upright shaft both above and below said carrier.

3. A centrifugal crushing'mill comprising a grinding chamber containing an annular die, a central upright shaft, a quill shaft having interior journal bearings adjacent its ends rotatably mounted thereon, a carrier secured to said quill shaft intermediate of said journals, a series of centrifugallyactuated grinding rolls depending from said carrier and movable in substantially radial planes in respect thereto to coperate with said-annular die, means for supportingsaid quill shaft independently of said central shaft and means for rotating the same.

et. A grinding mill having a base forming a grinding chamber containing an annular shaft detachably mounted in said boss, a quill shaft rotatably mounted on said central shaft, overheadmeans for supporting said quill shaft, means gcarried by said quill shaft to support centrifugally-actuated grinding rolls, and means for rotating said quill shaft. j w

5. A grinding mill comprising a grinding chamber containing an annular die, a central upright shaft, a quill shaft mounted thereon having an overhead carrier, rolls pivotally supported by said carrier in operative relation to said annular die, an inclosing casing, a screen within said casing and spaced therefrom, a spider carried by the lower end of said quill shaft provided with downwardly extending arms supporting plows adapted to force the material in the grinding pan into the path of the grinding rolls.

(3. In a" grinding mill comprising a grinding chamber containing an annular die, a

central upright shaft, a quill shaft mounted thereon and supportel independently thereof and having` an overhead carrier pivotally supporting a series of depending rolls in operative relation to said annular die,

an inclosed casing, a screen within said casing and spaced therefrom, a spider carried by said quill shaft provided with downwardly extending plow carriers and a Shield to form a co\er for the grinding chamber and to prevent the rising of the comminuted material or dust therefrom.

'7. A centrifugal crushing mill comprising a grinding chamber containing an annular die, an upright shaft, a quill shaft having interior i'ournals adjacent its ends rotatably .mounted thereon, means for su pporting said quill shaft independently of said upright shaft including a frame, a head adjustable thereon and cooperating bearing members in said head and upon said quill shaft.

8. A centrifugal crushing mill comprising a grinding chamber containing an annular die, a central upright shaft, a quill shaft `rotatably mounted thereon, means for supporting said quill shaft independently of said upright shaft comprising a frame, a head supported thereby, and universally adjustable therein, a journal to receive said `the latter comprising a wear plate secured to said head, a wear plate fastened to said quillv shaft', and antifriction means intermediate Vof said plate' and said ring.

10. A grinding mill comprising a grinding chamber containing an annular die, a central upright shaft, a quill shaft mounted thereon, an overhead carrier secured to said quill shaft, centrifugally operable rolls depending from said carrier and means* for supplying oil to said shafts and rolls comprising oil ducts formed by grooving the inner wall of said quill shaft and communieating ducts leading to the bearingsjof the grinder rolls.

l1. A grinding millcomprsing a grinding chamber containing an annular die, a central upright shaft, 'a quill shaft mounted thereon, an overhead carrier secured to said quill shaft, centrifugally operable rolls depending from said carrier, and means for supplying oil to said shafts and rolls comprising oil ducts formed by grooving the inner wall of said quill shaft, radial duts in said carrier connecting therewith and `flexible means connecting said radial ducts with the oil ducts leading to the grinders."

12. An overhead carrier for the rolls of a .centrifugal roller grinding mill comprising a base having openings therein through which material to be ground may be fed to the grinding chamber, ah upwardly extending fiange forming a hopper, and laterally projecting members provided with bearings forming fulcrums for the spindles of said grinding rolls,

13. An overhead carrier for the rolls of a centrifugal roller grinding mill comprising a base having openings therein, an upwardly extending flange' forming a hopper. and laterally projecting members provided with bearings forming' fulcrums for the ioo spindles of said grinding rolls to permit swinging movement in planes raidial thereto, said carrier being provided with lateral apertures therethrough to'conduct a lubriiso lar, groove aaptod to receive a rib on said slmft,'n1ea1xs for clamping the sections of 15 said spider upon the driving Shaft, and downwardly extending integral arms adapted to support plows.

In testimony whereof, have signed my name to this specication in the presence of 20 two subscribing witnesseS` LOVNA M. GRFFIN.

YWitnesses :v

ALBERT H. FEATHERSTONL E. G. Gmannmonn. 

